Watched a Google Snippets video made by Matt Cutts recently featured in MarketingPilgrim titled - Google’s Matt Cutts Discusses Search Snippets.
The Google Snippets video brought up a couple of points about how the title of the Search Snippet and how "site" links are chosen (algorithmic). I got the impression that Google is becoming more sophisticated in how it chooses content to put into a Google Snippet - thought Matt Cutts did a great job of explaining everything you'd need or want to know about how Google Search Snippets are formed.